[TheForge] JYH Trip Hammer question

[Peter Fels and Phoebe Palmer]

Dan:
Questions to Jock D are directly and " properly" addresses to Jock himself
http://anvilfire.com/gurusden/. He generally answers pretty promptly.
Your spring size and  connecting rod strength questions are  dependant on 
the weight of your hammer and the HP and RPMs you are going to put into it. 
The thing I'd do is, look at comparable hammers with similar mechanisms 
that have survived.
Strive to get as much solid mass  immediately under your hammer as possible.
Mild steel  for hammer faces ( super quenched ideally) suffices as long  as 
you only work hot mild steel or iron.
Pass on Jock's shock absorber linkage.
Have read that power hammers of this type in the orient have long soft 
springs and a long  stroke and tend to  be slower.
Hard packed sand that is capped will add a bit of strength to the upright 
and damping.
Under the anvil you want as much solid metal as possible.
Get the " pounding out the profits" book as a stylish path to self education.
Or find an old worn out hammer and rescue it....Pete


At 05:30 PM 11/28/02, you wrote:
>REF: NC-JYH
>REF URL http://www.anvilfire.com/power/
>
>I am going to start to put together my JYH power hammer (a copy of the NC JYH
>from the anvil fire site) and I have a question (Jock..if you are 
>listening, I
>think you are the one to answer this but I will take advice from anyone).
>Jock told me to use a leaf spring for the hammer mechanism. Now here are the
>questions
>
>1. What diameter is the rod connecting the wheel to the mechanism?
>2. Should I reinforce the wheel (the metal part..rim?) to take the continued
>extra shock of the above mentioned rod everytime the hammer hits the anvil?
>3. I found a regular size leaf spring of an old station wagon.  I would have
>to heat and bend it and I think that this would affect the spring and I dont
>think that I could get the spring back to "springyness"....so I thought I
>should buy a small leaf spring for a dune buggy (I found them at Northern
>Tools).  Advice?
>4. Surface of the anvil and the hammer....any good particular choices? tool
>steel? High carbon something of other?
>5.  Will filling the upright and the anvil with sand add stability, strength,
>dampening....or am I just out of my head here?
>6. Will I stop asking questions long enough for someone to answer?
>
>
>
>Okay .....
>
>Advice?
>
>Dan
>www.irontreework.com
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